- Office & Meeting Equipment & Supplies Rental, Fitchburg
- Office Furniture & Equipment Rental & Leasing, Fitchburg
- Office Supplies, Equipment & Office Furniture Stores, Fitchburg
- Oil & Gas Companies, Fitchburg
- Oil Burners Services, Fitchburg
- Oil Change & Lubrication, Fitchburg - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Fitchburg - Oil Companies
- Oil Petroleum Wholesale, Fitchburg
- Ophthalmic Goods, Fitchburg
- Ophthalmic Instruments & Machinery, Fitchburg
- Ophthalmologists, Fitchburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Fitchburg
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fitchburg
- Optometrists, Fitchburg - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Fitchburg - Eye Clinics
- Ornamental Greenhouses, Fitchburg
- Ornamental Nursery, Fitchburg
- Ornamental Nursery Services, Fitchburg
- Other Building Materials & Supplies, Fitchburg
- Other Electrical Products, Fitchburg
- Other Lodging, Fitchburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Fitchburg
- Outdoor Equipment & Accessories, Fitchburg
- Outdoor Furniture, Fitchburg
- Outdoor Furniture & Patio Furniture, Fitchburg - Garden Furniture Stores
- Outerwear Stores, Fitchburg - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Fitchburg - Outpatient Care
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